Sanitize demo.c and perf.c not to introduce a dependency on OpenGL or GLFW headers needlessly.#555

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marcel303 wants to merge 2 commits intomemononen:masterfrom

marcel303:non-opengl-compile-fixes

Commits on Jan 29, 2020

Sanitize demo.c and perf.c so they can be used to make a demo app with any backend, without introducing a dependency on OpenGL or GLFW headers.
marcel303
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Commits on Feb 2, 2020

Also guard startGPUTimer with DEMO_OPENGL.
marcel303
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